FIELD: physics, navigation.
SUBSTANCE: group of inventions relates to radio engineering. The result is achieved by determining the time for issuing a command to launch and detonate protective ordnance once the radar station determines the time of emergence of signals at differential frequencies (N+4)Fdo=(N+4)2Vofn/C and MFdo=N2Vofn/C, when a target is located at distances (Do/Vo)[Vi+(N+4)Vo] and (Do/Vo)(Vi+NVo), respectively, from the transmit-receive antenna of the radar station, where N is a positive number, fn is the frequency of radiated chirp signal, Vo, Vi and C denote the velocities of the protective ordnance, the target and light, Do is distance selected based on the condition Do/Vo=fn/Fmfd, fd and Fm denote frequency deviation and modulation frequency of the chirp signal, and measuring the time interval t between the emergence of said signals, after which, in accordance with the duration of the measured time interval t, two values are selected from a set of predetermined values: Di=(Do/Vo)(Vi+NVo) - range and (Vi+Vp) - the sum of velocities, and calculating the ratio t1=Di/(Vi+Vp), where Vp is the real velocity of the protective ordnance which determines the time between the launch of the protective ordnance when the target is located at a distance (Do/Vo)(Vi+NVo) from the transmit-receive antenna of the radar station and the time of detonation of the ordnance when the ordnance is located at the prediction point - the point of collision with the target. The proximity fuse comprises: a transmit-receive antenna, a chirp signal transmitter, a mixer, a differential frequency filter, a narrow-band signal detector, a shift register, an AND element, a pulse counter delay element, a count pulse generator, a dividing circuit, two read-only memory devices and a timing relay.
EFFECT: reduced weight and size and cost of the proximity fuse owing to use of only one radar station.
2 cl, 1 dwg
